build/tools/build-host-python.sh - platform/ndk - Git at Google

 #!/bin/sh
 #
 # Copyright (C) 2012 The Android Open Source Project
 # Copyright (C) 2012 Ray Donnelly <mingw.android at gmail.com>
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
 # Rebuild the host Python binaries from sources.
 #

 # include common function and variable definitions
 NDK_BUILDTOOLS_PATH="$(dirname $0)"
 . "$NDK_BUILDTOOLS_PATH/prebuilt-common.sh"
 . "$NDK_BUILDTOOLS_PATH/common-build-host-funcs.sh"

 PROGRAM_PARAMETERS=""
 PROGRAM_DESCRIPTION="\
 This program is used to rebuild one or more Python client programs from
 sources. To use it, you will need a working set of toolchain sources, like
 those downloaded with download-toolchain-sources.sh, then pass the
 corresponding directory with the --toolchain-src-dir=<path> option.

 By default, the script rebuilds Python for you host system [$HOST_TAG],
 but you can use --systems=<tag1>,<tag2>,.. to ask binaries that can run on
 several distinct systems. Each <tag> value in the list can be one of the
 following:

    linux-x86
    linux-x86_64
    windows
    windows-x86  (equivalent to 'windows')
    windows-x86_64
    darwin-x86
    darwin-x86_64

 For example, here's how to rebuild Python 2.7.3 on Linux
 for six different systems:

   $PROGNAME --build-dir=/path/to/toolchain/src \
     --python-version=2.7.3 \
     --systems=linux-x86,linux-x86_64,windows,windows-x86_64,darwin-x86,darwin-x86_64"

 TOOLCHAIN_SRC_DIR=
 register_var_option "--toolchain-src-dir=<path>" TOOLCHAIN_SRC_DIR "Select toolchain source directory"

 PYTHON_VERSION=$DEFAULT_PYTHON_VERSION
 register_var_option "--python-version=<version>" PYTHON_VERSION "Select Python version."

 NDK_DIR=$ANDROID_NDK_ROOT
 register_var_option "--ndk-dir=<path>" NDK_DIR "Select NDK install directory."

 PACKAGE_DIR=
 register_var_option "--package-dir=<path>" PACKAGE_DIR "Package prebuilt tarballs into directory."

 BUILD_DIR=
 register_var_option "--build-dir=<path>" BUILD_DIR "Build Python into directory"

 bh_register_options

 register_jobs_option

 extract_parameters "$@"

 if [ -n "$PARAMETERS" ]; then
     panic "This script doesn't take parameters, only options. See --help"
 fi

 if [ -z "$TOOLCHAIN_SRC_DIR" ]; then
     panic "Please use --toolchain-src-dir=<path> to select toolchain source directory."
 fi

 BH_HOST_SYSTEMS=$(commas_to_spaces $BH_HOST_SYSTEMS)

 # Python needs to execute itself during its build process, so must build the build
 # Python first. It should also be an error if not asked to build for build machine.
 BH_HOST_SYSTEMS=$(bh_sort_systems_build_first "$BH_HOST_SYSTEMS")

 # Make sure that the the user asked for the build OS's Python to be built.
 #  and that the above sort command worked correctly.
 if [ ! "$(bh_list_contains $BH_BUILD_TAG $BH_HOST_SYSTEMS)" = "first" ] ; then
     panic "Cross building Python requires building for the build OS!"
 fi

 download_package ()
 {
     # Assume the packages are already downloaded under $ARCHIVE_DIR
     local PKG_URL=$1
     local PKG_NAME=$(basename $PKG_URL)

     case $PKG_NAME in
         *.tar.bz2)
             PKG_BASENAME=${PKG_NAME%%.tar.bz2}
             ;;
         *.tar.gz)
             PKG_BASENAME=${PKG_NAME%%.tar.gz}
             ;;
         *)
             panic "Unknown archive type: $PKG_NAME"
     esac

     if [ ! -f "$ARCHIVE_DIR/$PKG_NAME" ]; then
         log "Downloading $PKG_URL..."
         (cd $ARCHIVE_DIR && run curl -L -o "$PKG_NAME" "$PKG_URL")
         fail_panic "Can't download '$PKG_URL'"
     fi

     if [ ! -d "$SRC_DIR/$PKG_BASENAME" ]; then
         log "Uncompressing $PKG_URL into $SRC_DIR"
         case $PKG_NAME in
             *.tar.bz2)
                 run tar xjf $ARCHIVE_DIR/$PKG_NAME -C $SRC_DIR
                 ;;
             *.tar.gz)
                 run tar xzf $ARCHIVE_DIR/$PKG_NAME -C $SRC_DIR
                 ;;
             *)
                 panic "Unknown archive type: $PKG_NAME"
                 ;;
         esac
         fail_panic "Can't uncompress $ARCHIVE_DIR/$PKG_NAME"
     fi
 }

 if [ -z "$BUILD_DIR" ] ; then
     BUILD_DIR=/tmp/ndk-$USER/buildhost
 fi

 bh_setup_build_dir $BUILD_DIR

 if [ "$BH_BUILD_MODE" = "debug" ] ; then
    PYDEBUG="-with-pydebug"
 fi

 # Sanity check that we have the right compilers for all hosts
 for SYSTEM in $BH_HOST_SYSTEMS; do
     bh_setup_build_for_host $SYSTEM
 done

 TEMP_DIR=$BUILD_DIR/tmp
 # Download and unpack source packages from official sites
 ARCHIVE_DIR=$TEMP_DIR/archive
 STAMP_DIR=$TEMP_DIR/timestamps
 BUILD_DIR=$TEMP_DIR/build-$HOST_TAG

 mkdir -p $BUILD_DIR

 PROGDIR=`dirname $0`
 PROGDIR=$(cd $PROGDIR && pwd)

 # Sanity check for all Python versions.
 for VERSION in $(commas_to_spaces $PYTHON_VERSION); do
     PYTHON_SRCDIR=$TOOLCHAIN_SRC_DIR/python/Python-$VERSION
     if [ ! -d "$PYTHON_SRCDIR" ]; then
         panic "Missing source directory: $PYTHON_SRCDIR"
     fi
 done

 # Return the build install directory of a given Python version
 # $1: host system tag
 # $2: python version
 # The suffix of this has to match python_ndk_install_dir
 #  as I package them from the build folder, substituting
 #  the end part of python_build_install_dir matching python_ndk_install_dir
 #  with nothing.
 # Needs to match with
 #  python_build_install_dir () in build-host-gdb.sh
 python_build_install_dir ()
 {
     echo "$BH_BUILD_DIR/install/prebuilt/$1"
 }

 # $1: host system tag
 # $2: python version
 python_ndk_package_name ()
 {
     echo "python-$2"
 }


 # Same as python_build_install_dir, but for the final NDK installation
 # directory. Relative to $NDK_DIR.
 python_ndk_install_dir ()
 {
     echo "prebuilt/$1"
 }

 arch_to_qemu_arch ()
 {
     case $1 in
         x86)
             echo i386
             ;;
         *)
             echo $1
             ;;
     esac
 }

 # $1: host system tag
 # $2: python version
 build_host_python ()
 {
     local SRCDIR=$TOOLCHAIN_SRC_DIR/python/Python-$2
     local BUILDDIR=$BH_BUILD_DIR/build-python-$1-$2
     local INSTALLDIR=$(python_build_install_dir $1 $2)
     local ARGS TEXT

     if [ ! -f "$SRCDIR/configure" ]; then
         panic "Missing configure script in $SRCDIR"
     fi

     ARGS=" --prefix=$INSTALLDIR"

     # Python considers it cross compiling if --host is passed
     #  and that then requires that a CONFIG_SITE file is used.
     # This is not necessary if it's only the arch that differs.
     if [ ! $BH_HOST_CONFIG = $BH_BUILD_CONFIG ] ; then
         ARGS=$ARGS" --build=$BH_BUILD_CONFIG"
     fi
     ARGS=$ARGS" --host=$BH_HOST_CONFIG"
     ARGS=$ARGS" $PYDEBUG"
     ARGS=$ARGS" --disable-ipv6"

     mkdir -p "$BUILDDIR" && rm -rf "$BUILDDIR"/*
     cd "$BUILDDIR" &&
     bh_setup_host_env

     CFG_SITE=
     # Need to add -L$HOST_STATIC_LIBDIR to LDSHARED if need
     # any static host libs.
     export LDSHARED="$CC -shared "
     if [ ! $BH_HOST_TAG = $BH_BUILD_TAG ]; then

         # Cross compiling.
         CFG_SITE=$BUILDDIR/config.site

         # Ideally would remove all of these configury hacks by
         # patching the issues.

         if [ $1 = darwin-x86 -o $1 = darwin-x86_64 ]; then
             echo "ac_cv_file__dev_ptmx=no"              > $CFG_SITE
             echo "ac_cv_file__dev_ptc=no"              >> $CFG_SITE
             echo "ac_cv_have_long_long_format=yes"     >> $CFG_SITE
             if [ $1 = darwin-x86 ] ; then
                 echo "ac_osx_32bit=yes"                >> $CFG_SITE
             elif [ $1 = darwin-x86_64 ] ; then
                 echo "ac_osx_32bit=no"                 >> $CFG_SITE
             fi
             echo "ac_cv_have_sendfile=no"              >> $CFG_SITE
             # I could change AC_MSG_CHECKING(LDSHARED) in configure.ac
             # to check $host instead of $ac_sys_system/$ac_sys_release
             # but it handles loads of platforms
             # and I can only test on three, so instead...
             export LDSHARED="$CC -bundle -undefined dynamic_lookup"
         elif [ $1 = windows-x86 -o $1 = windows-x86_64 ]; then
             echo "ac_cv_file__dev_ptmx=no"              > $CFG_SITE
             echo "ac_cv_file__dev_ptc=no"              >> $CFG_SITE
             CFLAGS=$CFLAGS" -D__USE_MINGW_ANSI_STDIO=1"
             CXXFLAGS=$CXXFLAGS" -D__USE_MINGW_ANSI_STDIO=1"
         elif [ $1 = linux-x86 -o $1 = linux-x86_64 ]; then
             echo "ac_cv_file__dev_ptmx=yes"             > $CFG_SITE
             echo "ac_cv_file__dev_ptc=no"              >> $CFG_SITE
             echo "ac_cv_have_long_long_format=yes"     >> $CFG_SITE
             echo "ac_cv_pthread_system_supported=yes"  >> $CFG_SITE
             echo "ac_cv_working_tzset=yes"             >> $CFG_SITE
             echo "ac_cv_little_endian_double=yes"      >> $CFG_SITE
         fi

         if [ $BH_HOST_OS = $BH_BUILD_OS ]; then
             # Only cross compiling from arch perspective.
             # qemu causes failures as cross-compilation is not detected
             # if a test executable can be run successfully, so we test
             # for qemu-${BH_HOST_ARCH} and qemu-${BH_HOST_ARCH}-static
             # and panic if either are found.
             QEMU_HOST_ARCH=$(arch_to_qemu_arch $BH_HOST_ARCH)
             if [ ! -z "$(which qemu-$QEMU_HOST_ARCH 2>/dev/null)" -o \
                  ! -z "$(which qemu-$QEMU_HOST_ARCH-static 2>/dev/null)" ] ; then
                panic "Installed qemu(s) ($(which qemu-$QEMU_HOST_ARCH 2>/dev/null) $(which qemu-$QEMU_HOST_ARCH-static 2>/dev/null))" \
                       "will prevent this build from working."
             fi
         fi
     fi

     TEXT="$(bh_host_text) python-$BH_HOST_CONFIG:"

     touch $SRCDIR/Include/graminit.h
     touch $SRCDIR/Python/graminit.c
     echo "" > $SRCDIR/Parser/pgen.stamp

     dump "$TEXT Building"
     export CONFIG_SITE=$CFG_SITE &&
     run2 "$SRCDIR"/configure $ARGS &&
     run2 make -j$NUM_JOBS &&
     run2 make -j$NUM_JOBS install
 }

 need_build_host_python ()
 {
     bh_stamps_do host-python-$1-$2 build_host_python $1 $2
 }

 # Install host Python binaries and support files to the NDK install dir.
 # $1: host tag
 # $2: python version
 install_host_python ()
 {
     local SRCDIR="$(python_build_install_dir $1 $2)"
     local DSTDIR="$NDK_DIR/$(python_ndk_install_dir $1 $2)"

     need_build_host_python $1 $2

     dump "$(bh_host_text) python-$BH_HOST_ARCH-$2: Installing"
     run copy_directory "$SRCDIR/bin"     "$DSTDIR/bin"
     run copy_directory "$SRCDIR/lib"     "$DSTDIR/lib"
     run copy_directory "$SRCDIR/share"   "$DSTDIR/share"
     run copy_directory "$SRCDIR/include" "$DSTDIR/include"
 }

 need_install_host_python ()
 {
     local SRCDIR="$(python_build_install_dir $1 $2)"

     bh_stamps_do install-host-python-$1-$2 install_host_python $1 $2

     # make sharedmods (setup.py) needs to use the build machine's Python
     # for the other hosts to build correctly.
     if [ $BH_BUILD_TAG = $BH_HOST_TAG ]; then
         export PATH=$SRCDIR/bin:$PATH
     fi
 }

 # Package host Python binaries into a tarball
 # $1: host tag
 # $2: python version
 package_host_python ()
 {
     local BLDDIR="$(python_build_install_dir $1 $2)"
     local SRCDIR="$(python_ndk_install_dir $1 $2)"
     # This is similar to BLDDIR=${BLDDIR%%$SRCDIR}
     BLDDIR=$(echo "$BLDDIR" | sed "s/$(echo "$SRCDIR" | sed -e 's/\\/\\\\/g' -e 's/\//\\\//g' -e 's/&/\\\&/g')//g")
     local PACKAGENAME=$(python_ndk_package_name $1 $2)-$1.tar.bz2
     local PACKAGE="$PACKAGE_DIR/$PACKAGENAME"

     need_install_host_python $1 $2

     dump "$(bh_host_text) $PACKAGENAME: Packaging"
     run pack_archive "$PACKAGE" "$BLDDIR" "$SRCDIR"
 }

 PYTHON_VERSION=$(commas_to_spaces $PYTHON_VERSION)
 ARCHS=$(commas_to_spaces $ARCHS)

 # Let's build this
 for SYSTEM in $BH_HOST_SYSTEMS; do
     bh_setup_build_for_host $SYSTEM
     for VERSION in $PYTHON_VERSION; do
         need_install_host_python $SYSTEM $VERSION
     done
 done

 if [ "$PACKAGE_DIR" ]; then
     for SYSTEM in $BH_HOST_SYSTEMS; do
         bh_setup_build_for_host $SYSTEM
         for VERSION in $PYTHON_VERSION; do
             package_host_python $SYSTEM $VERSION
         done
     done
 fi
	#!/bin/sh
	#
	# Copyright (C) 2012 The Android Open Source Project
	# Copyright (C) 2012 Ray Donnelly <mingw.android at gmail.com>
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.
	#
	# Rebuild the host Python binaries from sources.
	#

	# include common function and variable definitions
	NDK_BUILDTOOLS_PATH="$(dirname $0)"
	. "$NDK_BUILDTOOLS_PATH/prebuilt-common.sh"
	. "$NDK_BUILDTOOLS_PATH/common-build-host-funcs.sh"

	PROGRAM_PARAMETERS=""
	PROGRAM_DESCRIPTION="\
	This program is used to rebuild one or more Python client programs from
	sources. To use it, you will need a working set of toolchain sources, like
	those downloaded with download-toolchain-sources.sh, then pass the
	corresponding directory with the --toolchain-src-dir=<path> option.

	By default, the script rebuilds Python for you host system [$HOST_TAG],
	but you can use --systems=<tag1>,<tag2>,.. to ask binaries that can run on
	several distinct systems. Each <tag> value in the list can be one of the
	following:

	linux-x86
	linux-x86_64
	windows
	windows-x86 (equivalent to 'windows')
	windows-x86_64
	darwin-x86
	darwin-x86_64

	For example, here's how to rebuild Python 2.7.3 on Linux
	for six different systems:

	$PROGNAME --build-dir=/path/to/toolchain/src \
	--python-version=2.7.3 \
	--systems=linux-x86,linux-x86_64,windows,windows-x86_64,darwin-x86,darwin-x86_64"

	TOOLCHAIN_SRC_DIR=
	register_var_option "--toolchain-src-dir=<path>" TOOLCHAIN_SRC_DIR "Select toolchain source directory"

	PYTHON_VERSION=$DEFAULT_PYTHON_VERSION
	register_var_option "--python-version=<version>" PYTHON_VERSION "Select Python version."

	NDK_DIR=$ANDROID_NDK_ROOT
	register_var_option "--ndk-dir=<path>" NDK_DIR "Select NDK install directory."

	PACKAGE_DIR=
	register_var_option "--package-dir=<path>" PACKAGE_DIR "Package prebuilt tarballs into directory."

	BUILD_DIR=
	register_var_option "--build-dir=<path>" BUILD_DIR "Build Python into directory"

	bh_register_options

	register_jobs_option

	extract_parameters "$@"

	if [ -n "$PARAMETERS" ]; then
	panic "This script doesn't take parameters, only options. See --help"
	fi

	if [ -z "$TOOLCHAIN_SRC_DIR" ]; then
	panic "Please use --toolchain-src-dir=<path> to select toolchain source directory."
	fi

	BH_HOST_SYSTEMS=$(commas_to_spaces $BH_HOST_SYSTEMS)

	# Python needs to execute itself during its build process, so must build the build
	# Python first. It should also be an error if not asked to build for build machine.
	BH_HOST_SYSTEMS=$(bh_sort_systems_build_first "$BH_HOST_SYSTEMS")

	# Make sure that the the user asked for the build OS's Python to be built.
	# and that the above sort command worked correctly.
	if [ ! "$(bh_list_contains $BH_BUILD_TAG $BH_HOST_SYSTEMS)" = "first" ] ; then
	panic "Cross building Python requires building for the build OS!"
	fi

	download_package ()
	{
	# Assume the packages are already downloaded under $ARCHIVE_DIR
	local PKG_URL=$1
	local PKG_NAME=$(basename $PKG_URL)

	case $PKG_NAME in
	*.tar.bz2)
	PKG_BASENAME=${PKG_NAME%%.tar.bz2}
	;;
	*.tar.gz)
	PKG_BASENAME=${PKG_NAME%%.tar.gz}
	;;
	*)
	panic "Unknown archive type: $PKG_NAME"
	esac

	if [ ! -f "$ARCHIVE_DIR/$PKG_NAME" ]; then
	log "Downloading $PKG_URL..."
	(cd $ARCHIVE_DIR && run curl -L -o "$PKG_NAME" "$PKG_URL")
	fail_panic "Can't download '$PKG_URL'"
	fi

	if [ ! -d "$SRC_DIR/$PKG_BASENAME" ]; then
	log "Uncompressing $PKG_URL into $SRC_DIR"
	case $PKG_NAME in
	*.tar.bz2)
	run tar xjf $ARCHIVE_DIR/$PKG_NAME -C $SRC_DIR
	;;
	*.tar.gz)
	run tar xzf $ARCHIVE_DIR/$PKG_NAME -C $SRC_DIR
	;;
	*)
	panic "Unknown archive type: $PKG_NAME"
	;;
	esac
	fail_panic "Can't uncompress $ARCHIVE_DIR/$PKG_NAME"
	fi
	}

	if [ -z "$BUILD_DIR" ] ; then
	BUILD_DIR=/tmp/ndk-$USER/buildhost
	fi

	bh_setup_build_dir $BUILD_DIR

	if [ "$BH_BUILD_MODE" = "debug" ] ; then
	PYDEBUG="-with-pydebug"
	fi

	# Sanity check that we have the right compilers for all hosts
	for SYSTEM in $BH_HOST_SYSTEMS; do
	bh_setup_build_for_host $SYSTEM
	done

	TEMP_DIR=$BUILD_DIR/tmp
	# Download and unpack source packages from official sites
	ARCHIVE_DIR=$TEMP_DIR/archive
	STAMP_DIR=$TEMP_DIR/timestamps
	BUILD_DIR=$TEMP_DIR/build-$HOST_TAG

	mkdir -p $BUILD_DIR

	PROGDIR=`dirname $0`
	PROGDIR=$(cd $PROGDIR && pwd)

	# Sanity check for all Python versions.
	for VERSION in $(commas_to_spaces $PYTHON_VERSION); do
	PYTHON_SRCDIR=$TOOLCHAIN_SRC_DIR/python/Python-$VERSION
	if [ ! -d "$PYTHON_SRCDIR" ]; then
	panic "Missing source directory: $PYTHON_SRCDIR"
	fi
	done

	# Return the build install directory of a given Python version
	# $1: host system tag
	# $2: python version
	# The suffix of this has to match python_ndk_install_dir
	# as I package them from the build folder, substituting
	# the end part of python_build_install_dir matching python_ndk_install_dir
	# with nothing.
	# Needs to match with
	# python_build_install_dir () in build-host-gdb.sh
	python_build_install_dir ()
	{
	echo "$BH_BUILD_DIR/install/prebuilt/$1"
	}

	# $1: host system tag
	# $2: python version
	python_ndk_package_name ()
	{
	echo "python-$2"
	}


	# Same as python_build_install_dir, but for the final NDK installation
	# directory. Relative to $NDK_DIR.
	python_ndk_install_dir ()
	{
	echo "prebuilt/$1"
	}

	arch_to_qemu_arch ()
	{
	case $1 in
	x86)
	echo i386
	;;
	*)
	echo $1
	;;
	esac
	}

	# $1: host system tag
	# $2: python version
	build_host_python ()
	{
	local SRCDIR=$TOOLCHAIN_SRC_DIR/python/Python-$2
	local BUILDDIR=$BH_BUILD_DIR/build-python-$1-$2
	local INSTALLDIR=$(python_build_install_dir $1 $2)
	local ARGS TEXT

	if [ ! -f "$SRCDIR/configure" ]; then
	panic "Missing configure script in $SRCDIR"
	fi

	ARGS=" --prefix=$INSTALLDIR"

	# Python considers it cross compiling if --host is passed
	# and that then requires that a CONFIG_SITE file is used.
	# This is not necessary if it's only the arch that differs.
	if [ ! $BH_HOST_CONFIG = $BH_BUILD_CONFIG ] ; then
	ARGS=$ARGS" --build=$BH_BUILD_CONFIG"
	fi
	ARGS=$ARGS" --host=$BH_HOST_CONFIG"
	ARGS=$ARGS" $PYDEBUG"
	ARGS=$ARGS" --disable-ipv6"

	mkdir -p "$BUILDDIR" && rm -rf "$BUILDDIR"/*
	cd "$BUILDDIR" &&
	bh_setup_host_env

	CFG_SITE=
	# Need to add -L$HOST_STATIC_LIBDIR to LDSHARED if need
	# any static host libs.
	export LDSHARED="$CC -shared "
	if [ ! $BH_HOST_TAG = $BH_BUILD_TAG ]; then

	# Cross compiling.
	CFG_SITE=$BUILDDIR/config.site

	# Ideally would remove all of these configury hacks by
	# patching the issues.

	if [ $1 = darwin-x86 -o $1 = darwin-x86_64 ]; then
	echo "ac_cv_file__dev_ptmx=no" > $CFG_SITE
	echo "ac_cv_file__dev_ptc=no" >> $CFG_SITE
	echo "ac_cv_have_long_long_format=yes" >> $CFG_SITE
	if [ $1 = darwin-x86 ] ; then
	echo "ac_osx_32bit=yes" >> $CFG_SITE
	elif [ $1 = darwin-x86_64 ] ; then
	echo "ac_osx_32bit=no" >> $CFG_SITE
	fi
	echo "ac_cv_have_sendfile=no" >> $CFG_SITE
	# I could change AC_MSG_CHECKING(LDSHARED) in configure.ac
	# to check $host instead of $ac_sys_system/$ac_sys_release
	# but it handles loads of platforms
	# and I can only test on three, so instead...
	export LDSHARED="$CC -bundle -undefined dynamic_lookup"
	elif [ $1 = windows-x86 -o $1 = windows-x86_64 ]; then
	echo "ac_cv_file__dev_ptmx=no" > $CFG_SITE
	echo "ac_cv_file__dev_ptc=no" >> $CFG_SITE
	CFLAGS=$CFLAGS" -D__USE_MINGW_ANSI_STDIO=1"
	CXXFLAGS=$CXXFLAGS" -D__USE_MINGW_ANSI_STDIO=1"
	elif [ $1 = linux-x86 -o $1 = linux-x86_64 ]; then
	echo "ac_cv_file__dev_ptmx=yes" > $CFG_SITE
	echo "ac_cv_file__dev_ptc=no" >> $CFG_SITE
	echo "ac_cv_have_long_long_format=yes" >> $CFG_SITE
	echo "ac_cv_pthread_system_supported=yes" >> $CFG_SITE
	echo "ac_cv_working_tzset=yes" >> $CFG_SITE
	echo "ac_cv_little_endian_double=yes" >> $CFG_SITE
	fi

	if [ $BH_HOST_OS = $BH_BUILD_OS ]; then
	# Only cross compiling from arch perspective.
	# qemu causes failures as cross-compilation is not detected
	# if a test executable can be run successfully, so we test
	# for qemu-${BH_HOST_ARCH} and qemu-${BH_HOST_ARCH}-static
	# and panic if either are found.
	QEMU_HOST_ARCH=$(arch_to_qemu_arch $BH_HOST_ARCH)
	if [ ! -z "$(which qemu-$QEMU_HOST_ARCH 2>/dev/null)" -o \
	! -z "$(which qemu-$QEMU_HOST_ARCH-static 2>/dev/null)" ] ; then
	panic "Installed qemu(s) ($(which qemu-$QEMU_HOST_ARCH 2>/dev/null) $(which qemu-$QEMU_HOST_ARCH-static 2>/dev/null))" \
	"will prevent this build from working."
	fi
	fi
	fi

	TEXT="$(bh_host_text) python-$BH_HOST_CONFIG:"

	touch $SRCDIR/Include/graminit.h
	touch $SRCDIR/Python/graminit.c
	echo "" > $SRCDIR/Parser/pgen.stamp

	dump "$TEXT Building"
	export CONFIG_SITE=$CFG_SITE &&
	run2 "$SRCDIR"/configure $ARGS &&
	run2 make -j$NUM_JOBS &&
	run2 make -j$NUM_JOBS install
	}

	need_build_host_python ()
	{
	bh_stamps_do host-python-$1-$2 build_host_python $1 $2
	}

	# Install host Python binaries and support files to the NDK install dir.
	# $1: host tag
	# $2: python version
	install_host_python ()
	{
	local SRCDIR="$(python_build_install_dir $1 $2)"
	local DSTDIR="$NDK_DIR/$(python_ndk_install_dir $1 $2)"

	need_build_host_python $1 $2

	dump "$(bh_host_text) python-$BH_HOST_ARCH-$2: Installing"
	run copy_directory "$SRCDIR/bin" "$DSTDIR/bin"
	run copy_directory "$SRCDIR/lib" "$DSTDIR/lib"
	run copy_directory "$SRCDIR/share" "$DSTDIR/share"
	run copy_directory "$SRCDIR/include" "$DSTDIR/include"
	}

	need_install_host_python ()
	{
	local SRCDIR="$(python_build_install_dir $1 $2)"

	bh_stamps_do install-host-python-$1-$2 install_host_python $1 $2

	# make sharedmods (setup.py) needs to use the build machine's Python
	# for the other hosts to build correctly.
	if [ $BH_BUILD_TAG = $BH_HOST_TAG ]; then
	export PATH=$SRCDIR/bin:$PATH
	fi
	}

	# Package host Python binaries into a tarball
	# $1: host tag
	# $2: python version
	package_host_python ()
	{
	local BLDDIR="$(python_build_install_dir $1 $2)"
	local SRCDIR="$(python_ndk_install_dir $1 $2)"
	# This is similar to BLDDIR=${BLDDIR%%$SRCDIR}
	BLDDIR=$(echo "$BLDDIR" \| sed "s/$(echo "$SRCDIR" \| sed -e 's/\\/\\\\/g' -e 's/\//\\\//g' -e 's/&/\\\&/g')//g")
	local PACKAGENAME=$(python_ndk_package_name $1 $2)-$1.tar.bz2
	local PACKAGE="$PACKAGE_DIR/$PACKAGENAME"

	need_install_host_python $1 $2

	dump "$(bh_host_text) $PACKAGENAME: Packaging"
	run pack_archive "$PACKAGE" "$BLDDIR" "$SRCDIR"
	}

	PYTHON_VERSION=$(commas_to_spaces $PYTHON_VERSION)
	ARCHS=$(commas_to_spaces $ARCHS)

	# Let's build this
	for SYSTEM in $BH_HOST_SYSTEMS; do
	bh_setup_build_for_host $SYSTEM
	for VERSION in $PYTHON_VERSION; do
	need_install_host_python $SYSTEM $VERSION
	done
	done

	if [ "$PACKAGE_DIR" ]; then
	for SYSTEM in $BH_HOST_SYSTEMS; do
	bh_setup_build_for_host $SYSTEM
	for VERSION in $PYTHON_VERSION; do
	package_host_python $SYSTEM $VERSION
	done
	done
	fi